Utilizing Results from InSAR to Develop Seismic Location Benchmarks and Implications for Seismic Source Studies

Conclusions and Recommendations

  • InSAR can be a valuable tool for ground-truth tests of event locations, particularly for those associated with GNEM R&E studies.
  • InSAR has already been successfully used as a ground-truth test for the relocation of the Tibet mainshock using 2-D travel-time corrections, removing the 20-km location bias (Steck et al., 2000).
  • Able to limit the possible secondary rupture events by using synthetic tests with events restricted to the rupture trace identified by InSAR.
  • InSAR provides a means of estimating magnitude by providing information on fault displacement and area. Able to estimate the magnitude for a secondary rupture event at Mw = 4.8-5.1 which should have been detected by stations within regional distances.
  • Analysis of the travel time residuals and the relocation results suggests that no cataloged event can be associated with the secondary rupture. Thus, the secondary rupture was aseismic in nature or, most likely, coseismic with the mainshock.
    • Introduction | Surface Rupture | Data and Velocity Models | Synthetic Tests and Relocation Procedure | Search for Secondary Rupture Event | Relocation Results | Waveforms for Candidate Events | Relocation of Candidate Events | Conclusions and Recommendations | References